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3 Sheets-Sheet 1. G. WOOLNOIUGH.

Process for Making Pattern. Plates. No. 229,294. Patented June 29, 1880.

3 Sne'ets- -Sheet 2.

t G. WOOLNOUGH, Process for Making Pattern Plates. No. 229,294. PatentedJune 29,1880.

Fig. 6*-

N-FETERs, PHOTO-LITHOGRAFHER WASHINGTON. D C

3 Sheets-Sheet 3.

G. WOOLNOUGH. Process for Making Pattern Plates. No. 229,294. PatentedJune 29, 1880. Fig-.3

NYPErERS, FHOYUUTHOGRAPHER, WAWWGTON, u C.

UNITED STATES GEORGE WOOLNOUGH, OF

PATENT ()FFrcE.

HALBERSTADT, PRUSSIA.

SPECIFICATION forming part of Letters Application filed October 29,1817.

To all whom it may concern:

Be it known that I, GEORGE WooLNoUen, of Halberstadt, Kingdom ofPrussia, have invented a new and useful Improvement in the Process ofManufacture of Pattern or Molding Plates used in Making Molds for Gasting Metals, of which the following is a specification.

My invention relates to an improvement in the process of manufacture ofpattern or moldin g plates with pattern attached, to be used in makingsand molds for metal castings.

The method of fixing patterns suited for the purpose to the molding orflask board and of drawing them out of the sand by-the latter has beenpracticed for years. Subsequently the halves of a number ofpatterns werescrewed to the two sides of a metal plate for the purpose of moldingthem and drawing them out of the sand together.

According to another method a plate is cut out or cast in such a manneras to fit around the pattern along its parting-line, (see AmericanPatent No. 181,194 to J. B. McGune.) and thepattern is withdrawn fromthe sand through the opening in said plates either by hand or by meansof a suitable molding apparatus.

For the purpose of casting patterns together with plates the practicehas hitherto been as follows: The halves of the divided original patternare molded into the two parts of a flask. These are then fixed togetherwith a small space between them, whereupon the mold is filled withmetal. The casting thus made is a straight plate with the pattern-halveson its two sides. There are,however,numer'ous patterns which cannot bedivided into halves for the purpose of molding themas, for instance,plummer-block of a portable engine. (Represented in Figure 1.) Moreover,it is impossible to draw a metal pattern of such size and weight out ofthe sand by hand.

For the purpose of casting the metal pattern with plate after anoriginal wooden pattern of this plummer-block, and for rendering it fitto be handled by a molding-machine, I proceed as follows:

In the drawings, Fig. l is an elevation of a plummer-block. Figs. 2 and3 are views of the large flasks, showing process of making Patent No.229,294, dated June 29, 1880.

Patented in England June 14, 1876.

the pattern-plate. Fig. at shows pattern-plate on half-flask formolding. Figs. 5 and 6 show the method of operating a pattern-plate on amolding-machine. Fig. 7 is a cross-section of the two half-flasksseparated by the thickness- 5 5 pieces and ready for the cast.

The original wooden pattern M, Fig. 1, or a plummer block cast in thesand and serving as a pattern, is molded in a rather large double flask,as shown by Figs. 2 and 3. The pattern M having been taken out of thesand, a Wooden or metal frame, D, open or closed in the center, as theshape of the pattern or mold may call for, provided with two journals, kk, is placed on the face of one of the mold partssay on B, as shown bydotted lines in Figs. 2 and 3 and by full lines in Fig. 4. Previously asmall quantity of sand has to be removed for the journals. Sand is thenfilled in around the frame D, and, after the frame is removed, made evenwith its top surface, and the journals are properly molded up to themiddle. After this the frame D is placed on the mold part 0 andcarefully adjusted by measurement, so that its position correspondsexactly with the position which it had on the mold part B. The otherhalf of each of the journals is then molded, and the flask parts areplaced together; but, for preventing the mold from being damaged, piecesof iron, 0, of the 80 thickness of the frame D, have to be introducedbetween the rims of the flask, so as to keep them apart the necessarydistance. The casting made in the mold thus prepared will have the shapeas shown in Fig. 5. The plate h of the same is curved along its line ofjunction with the pattern, according as the surface of the sand has tobe shaped for allowing the original pattern to be drawn out.

Figs. 5 and 6 show thepattern-plate mounted in bearings with ahalf-flask attached, that after one half-flask is molded thepattern-plate is turned over, the molded half-flask removed, and theother half-flask attached, as set forth in patent granted to me andnumbered 225,314..

It barely requires to be mentioned that the plummer-block M, Fig. 1, hasbeen selected only as an example for explaining the described process,and that other patterns may be cast, together with plates,in a similarmanner. 100

suffioient sand from the flask to mold the lower part of the trunnions;then in removing said frame; then in molding the remaining part of 15the trunnions in the other half-flask then in placing the twohalf-flasks together, keeping them the proper distance apart byseparatingpieces, and, finally, in filling the space in the; I

flasks with metal. I

GEORGE WOOLNOUGH. Witnesses:

FRIEDRICH DELM J. FRED DENNIS.

